Patch "bridge: drop netfilter fake rtable unconditionally" has been added to the 4.10-stable tree

This is a note to let you know that I've just added the patch titled

bridge: drop netfilter fake rtable unconditionally

to the 4.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
bridge-drop-netfilter-fake-rtable-unconditionally.patch
and it can be found in the queue-4.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Florian Westphal <[email protected]>
Date: Mon, 13 Mar 2017 17:38:17 +0100
Subject: bridge: drop netfilter fake rtable unconditionally

From: Florian Westphal <[email protected]>

[ Upstream commit a13b2082ece95247779b9995c4e91b4246bed023 ]

Andreas reports kernel oops during rmmod of the br_netfilter module. Hannes debugged the oops down to a NULL rt6info->rt6i_indev.

Problem is that br_netfilter has the nasty concept of adding a fake rtable to skb->dst; this happens in a br_netfilter prerouting hook.

A second hook (in bridge LOCAL_IN) is supposed to remove these again before the skb is handed up the stack.

However, on module unload hooks get unregistered which means an skb could traverse the prerouting hook that attaches the fake_rtable, while the 'fake rtable remove' hook gets removed from the hooklist immediately after.

---
 net/bridge/br_input.c           |    1 +
 net/bridge/br_netfilter_hooks.c |   21 ---------------------
 2 files changed, 1 insertion(+), 21 deletions(-)

@@ -29,6 +29,7 @@ EXPORT_SYMBOL(br_should_route_hook);
 static int
 br_netif_receive_skb(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
+	br_drop_fake_rtable(skb);
 	return netif_receive_skb(skb);
 }
 

@@ -521,21 +521,6 @@ static unsigned int br_nf_pre_routing(vo
 }
 
 
-/* PF_BRIDGE/LOCAL_IN ************************************************/
-/* The packet is locally destined, which requires a real
- * dst_entry, so detach the fake one.  On the way up, the
- * packet would pass through PRE_ROUTING again (which already
- * took place when the packet entered the bridge), but we
- * register an IPv4 PRE_ROUTING 'sabotage' hook that will
- * prevent this from happening. */
-static unsigned int br_nf_local_in(void *priv,
-				   struct sk_buff *skb,
-				   const struct nf_hook_state *state)
-{
-	br_drop_fake_rtable(skb);
-	return NF_ACCEPT;
-}
-
 /* PF_BRIDGE/FORWARD *************************************************/
 static int br_nf_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
 {

@@ -908,12 +893,6 @@ static struct nf_hook_ops br_nf_ops[] __
 		.priority = NF_BR_PRI_BRNF,
 	},
 	{
-		.hook = br_nf_local_in,
-		.pf = NFPROTO_BRIDGE,
-		.hooknum = NF_BR_LOCAL_IN,
-		.priority = NF_BR_PRI_BRNF,
-	},
-	{
 		.hook = br_nf_forward_ip,
 		.pf = NFPROTO_BRIDGE,
 		.hooknum = NF_BR_FORWARD,

Patches currently in stable-queue which might be from [email protected] are

queue-4.10/ipv6-avoid-write-to-a-possibly-cloned-skb.patch queue-4.10/bridge-drop-netfilter-fake-rtable-unconditionally.patch